Here's what really makes the add a joke:
1. 145MPH Speedometer (which you can see in the pic of the odometer) - Standard GNs have a 85MPH dash and GNXs have Stewart Warner gauges that are circular. Only the police conversions come with the 145MPH dash
3. The 124MPH governor that is set in the EPROM was taken out of the police GNs allowing them to run in excess of 140MPH. This car of course does NOT have the 124MPH governor on it.